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Finding the Fourth Proportional to 327.78, 491.91 and 154.64

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Solution

The fourth proportional to 327.78, 491.91 and 154.64 is: 232.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.78 : 491.91 = 154.64 : x
  2. Step 2: Convert to fraction form
    327.78/491.91 = 154.64/x
  3. Step 3: Cross multiply
    327.78x = 491.91 × 154.64
  4. Step 4: Simplify right side
    327.78x = 76,069.61
  5. Step 5: Solve for x
    x = 76,069.61/327.78
  6. Step 6: Final answer
    x = 232.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.